Machine for making bolts



Jan. 11, 1938. I .1. H. FRIEDMAN 2,104,944

MACHINE FOR MAKING BOLTS Filed Nov. 15, 1935 4 SheetsSheet l 7'0 POINTER MOTOR 5W Brmentor JOHN H. FE/EDMAA/ BYU' attorneys Jan. 11, 1938. FRlEDMAN 2,104,944

MACHINE FOR MAKING BOLTS Filed Nov. 13, 1955 4 Sheets-Sheet 2 70 Amman/04 70R 7a ANA/UA/C/A 70/? Imventor JOHN H PIE/.EDNA/V (Ittornegs Jan. 11, 1938. 1 H, FRlEDMAN 2,104,944

MACHINE FOR MAKING BOLTS Filed Npv. 15, 1955 4 Sheets-Sheet 3 Envcnfor JOHN H FE/EDMA/V dttorncgls Jan. 11, 1938. FRIEDMAN 2,104,944

MACHINE FOR MAKING BOLTS Filed Nov. 13, 1955 4 Sheets-Sheet 4 GFFICE IVEACHINE FOR MAKING BOLTS John H. Friedman, Tiffin, Ohio, assignor to The National Machinery Company, Tifiin, Ohio, a corporation of Ohio Application November 13, 1935, Serial No. 49,479

14 Claims. (Cl. 10-23) This invention relates to machines for makand. it is frequently necessary in machines of this ing bolts, nuts or the like and more particularly character in which the safety devices are adapted to a system of safety devices for such machines. to function at any time during the cycle of the The invention in the present embodiment is illusmachine to more or less dismantle the machine trated as applied to a bolt machine such as shown in order to free the header slide and dies of the 5 and claimed in the following copending applicapartially worked blanks. An alternative method of ilions: Earl R. Frost, Serial No. 639,054, filed freeing the header slide and the bed frame dies of October 22, 1932, Earl R. Frost, Serial No. 662,719, partially worked blanks in. the event of such a filed March 25, 1933, William L. Clouse, Serial No. jam involves the application of excessively high 0 718,182, filed March 30, 1935 and John H. Friedtorque to the driving mechanism of the machine man, Serial No. 712,220, filed February 20, 1934. such as inserting long bars or levers in the main In machines for making bolts and the like of drive of the mechanism to force the header slide the type disclosed in said copending applications forward or withdraw the header slide from its forwhere a section of rod stock is sheared into suitward position. In any event a safety device .a able blank lengths and said blank lengths are which functions to permit the header slide to operated upon by various fabricating mechastop in its most forward position requires a subnisms, it is extremely desirable that safety destantial shut-down of the machine to free the vices be provided to stop the machine or the tools of partially worked blanks which is alaboriparticular fabricating step in the event that a one and expensive operation,

: bolt blank becomes jammed or misaligned, and The importance of bringing the header slide thus prevent damage or destruction of the bolt to a stop on its receding movement or back center machine. It is broadly old in various mechanical position with respect to the dies will be appreciarts to provide breakable shaft pins or spring ated by a consideration of a machine without latched safety devices in the drive of various any safety devices. For instance, if subsequent a: mechanisms to prevent injury to the mechanism to a working of the blank in a bed frame die by in event of an overload or jam during the operathe header slide, an ejector pin breaks during the tion. In the application of such safety devices ejection of the blank, the transfer fingers which to a bolt making machine of the type disclosed have been positioned to engage the ejected blank and claimed in said copending applications and are unable to move the blank away from the die variations thereof wherein a relatively massive due to its partial ejection. In the absence of any header slide reciprocates within a bed frame to release in the transfer mechanism it will be broken head and/ or extrude and/or trim a bolt blank, by the overload thus imposed and the header slide it will be seen that a stopping of the machine by on its approach to the bed frame dies will forcibly functioning of the safety device while the header engage a broken transfer mechanism and one or slide is in its most forward position; that is, workmore partially ejected blanks. If the transfer ing the blank in the dies of the bed frame will mechanism were not broken in its attempt to jam or lock the header slide in said forward positransfer the partially ejected blank, the header tion. 'The danger of such a jam will be better slide would be approaching the bed frame dies understood when it is appreciated that one blank at a time when a section of unworked blank stock may be part way extruded into the die of the bed was being moved in toward the dies by the cut- 40 frame and another bolt blank may be partly off and there would be one more blank between trimmed by a trimming punch carried in the the header slide and bed frame than there were header slide at the time that the safety device die stations which would obviously disrupt and becomes operative to stop the machine and thus damage the machine.

:7 deprive the header slide of its momentum at a Since recent developments have resulted in time when such momentum is essential to the machines of this type which run at high speeds completion of the extruding, heading or trimming and wherein the header slide acquires considerastep. Where nuts are being formed in this type of ble momentum in its reciprocation, the bringing machine and the header slide permitted to stop of the entire machine to a full stop in a short on its forward stroke the punches or piercing space of time presents considerable difficulty in 50 tools will be locked within the nut blank and the conjunction with safety devices. During the cycle header slide being without momentum cannot be of the machine the most forward position and moved by the normal force of the driving motor. the most rearward or back center position pre- The blanks become locked in the dies by the sents the most opportune time to bring the headpressure resulting. from their partial working er slide to a stop, since during this phase of the "sition.

cycle the flywheel or other moving parts must overcome the inertia or tendency of the header slide to continue its directional movement. Of said two opportune times at which to bring the header slide to a stop the most forward position is the most convenient and natural, since it is during this phase that the working of the blanks supplements the other moving parts of the machine in their action to overcome the inertia or tendency of the header slide to continue its forward movement. usually been operative to stop the machine on its most forward stroke and as above pointed out by illustration considerable damage results from stopping the header slide during this phase of its cycle.

It is among the objects of my invention to provide a safety mechanism for machines of the type indicated which will operate to prevent any damage to the machine and which will function to stop the machine only when the header slide is on its back stroke or away from the dies. It

is a furtherobject of my invention to co-ordinate,

a series of safety devices so that the functioning of any one of said devices will be effective to stop the driving force of the machine. A further object of my invention is to arrange a series of safety devices in accordance with the preceding object'so that the location of the overload or jam will be visibly and/or audibly indicated to the machine operator. A further object of my invention is to provide a safety mechanism for a blank ejecting assembly which will function to stop the bolt machine only when the header slide is in a back center or retracted po- A further object of my invention is to provide a safety device for a transfer mechanism such as shown in said co-pending application to William L. Clouse, Serial No. 718,182 above referred to wherein said device becomes operative to stop the bolt machine only when the header slide is in a back center or retracted position. A further object of my invention is to provide a safety device for a pointer transfer tube and track such as shown in said copending application of John H. Friedman, Serial No. 712,220 above referred to which will become operative to stop the bolt machine only when the header slide has moved away from its most forward position. A further object of my invention is to provide a safety device for a roll threader blank feeding mechanism such as shown in the copending application to Earl R. Frost, Serial No. 662,719 above referred to. It is a further object of my invention to provide a machine of the character described with a plurality of safety devices, any

one of which upon functioning will sequentially, prevent the application of a positive forward driving force to the machine, reverse the direc- .iona1 effect of the driving force of the machine and'ma'intain the reversal of the directional effect of the driving force until the machine comes I to a full stop. It is a further object of my invention to provide a safety mechanism for a bolt machine having a main motor and a pointer motcr which will upon functioning in response to a jamor overload sequentially stop the flow mentioned flow of energy until the machine comes, to a full stop.

1 Further objects and advantages relating to safety and economies of manufacture will be Heretofore safety devices have understood from the following description and the accompanying drawings wherein:

Figure 1 is a plan View of a bolt machine diagrammatically showing the location of the various safety devices;

Figure 2 is an enlarged plan View of the safety switch applied to the blank track of a pointer mechanism;

Figure 3 is an elevation looking toward the header slide with parts in section showing the i1 arrangement of the safety switch which cooperates with a blank transferring tube;

Figure 4 is a side elevation of the safety switch of Figure 3; I

Figure 5 is a sectional view taken on line 5-5 of Figure 4;

Figure 6 is an enlarged detailed showing with parts in section of the safety switch applied toan ejector assembly;

Figure 7 is a detailed showing with parts in section of a safety switch applied to the carriage drive of the blank transferring mechanism;

Figure 8 is a sectional view of a safety switch operatively connected to the'carriage support of a blank transferring mechanism;

Figure 9 is a detailed showing with parts in section of a safety switch applied to the roll threader blank feeding mechanism;

Figure 10 is a wiring diagram of the safety switch assembly as applied to a particular machine.

The objects outlined above have been attained generally by providing at various places. throughout a bolt machine parts which are resiliently or otherwise mounted to respond to jams or overloads and arranging electrical contact devices between said movable parts so that an electrical circuit is maintained or broken by the relative position of the parts. In the present embodiment I have arranged the switches so that when the parts are assembled for operation of the machine a circuit will be maintained through the assembly. At another point in the circuit of each switch I have arranged a relay and an annunciator so that in the event of a jam or overload which functions to break the circuit at a particular safety switch, the effect of the broken circuit will be transmitted to the relay and to the annunciator in the same circuit. The operative effect in the relay is to break another circuit which may be referred to as a solenoid circuit and as the solenoid circuit is broken devices in the solenoid circuit operate utimately to bring the bolt making machine to a stop. An annunciator which is arranged in series with the relay is also actuated by the break in the safety switch to operate an annunciator so as to indicate to the operator of the bolt machine which of the various safety switches has brought about the stopping of the machine. Although the safety switches, relays and annunciators in the present embodiment are arranged to be. actuated by a chine having a bed frame Hi provided with a reciprocating header slide H which carries on its forward end a series of dies or punches l2, I3 and Id arranged to cooperate with and work bolt blanks in the bed frame dies l5, l6 and IT. The rearward portion of said header slide is provided with a roll threading die "3 arranged to cooperate with a complementary frame carried die l9, and a pointing mechanism 20 is arranged at one side of the bolt machine to point the blanks intermediate the forming of the blank and the roll threading. To transfer bolt blanks which are successively worked in the dies at the forward end of the machine from said dies to the pointer, a transfer tube 2! is pivoted to the header slide and communicates with a passageway in said header slide which receives blanks from the die it and maintains said blanks in head-to-tail arrangement as they are moved up into the tube 21. The underside of the tube 2| is slotted to permit the shank end of the blank to drop so as to position the blank vertically and guide the same to the pointer track. As the bolt blanks leave the tube 2| they are conducted between a pair of parallel rails or tracks and are fed into a chuck arranged within the pointing mechanism 26. A motor having a cutting tool is arranged beneath the chuck and forms a point upon the blanks as they pass successively from the heading tools through the pointer and onto the track 22 which leads to the roll threading dies. Reference is made to the above cited copending applications regarding the structure and operation of this machine and to the copending application of Friedman, Serial No. 49 l'77 filed November 13, 1935 with respect to the track leading from the pointer to the roll threading device and feed mechanism in said roll threader.

To indicate the location of the various safety devices making up the safety switch assembly a series of circles numbered 2, 3, 5, T, 8 and 9 are superimposed upon the plan showing of the machine in Figure 1. Detailed showings of the devices indicated by said circles are found in the figures of the drawings which are provided with view numbers corresponding to the numbers of said circles. The same numbers are retained to identify the corresponding safety switches in the wiring diagram of Figure 10. The wires which lead from the safety switches to the relay and annunciator boxes are identified by the addition of the letter a. to the number applied to the particular safety switch. For instance, the wire which leads from the safety switch mechanism 6 is identified by to and this notation is likewise maintained in the wiring diagram of Figure 10.

Considering the safety devices in the order in which the stock is worked in the machine, the device of Figure 6 which is applied to the ejector mechanism comprises a shaft 36 which extends generally transversely of the bolt machine and is rocked upon its axis to move a series of ejector rods to eject blanks from the dies subsequent to their working therein. The shaft 33 is actuated through the medium of 2, depending arm 3! which is secuered to the shaft 38 by a breakable pin 32. In the normal operation of the machine the arm 3! is oscillated by a reciprocating rod operatively connected to the crankshaft of the bolt machine. Should a worked bolt blank become lodged in the bed frame dies H5, H5 and I? or any other thing occur which would prevent the orderly ejection of the blank, the reaction will be taken through the ejector rod assembly to the shaft 38 and the resistance of the shaft 36 to turning upon its axis will shear 01f the breakable bolt 32. It will be understood by those skilled in the art that the arm 3| will only be forcibly actuated when the header slide is moving away from the bed frame dies, since the ejector rods would not be timed to eject the blanks at any other time.

A ring 33 is keyed to the shaft 30 and carries on its outer periphery a ring of insulating material 34 which in turn carries a collector ring 35. Secured to the collector ring 35 and projecting transversely thereof is a switch element 36 which normally contacts a cooperating element 37 which is secured to the arm 3|. A brush 38 bears against the collector ring 35 and is secured through the medium of a block of insulating material to the casting or member within which the shaft 30 rotates. A wire 6a is connected to the brush 38 and said wire to leads through the relay box R to the annunciator box A. One side of a low voltage line L is grounded to the bed frame and the other side of the said low voltage line V leads to the relay and annunciator boxes A and R. In the embodiment illustrated the low voltage line LV is preferably about 24 volts and the devices used in conjunction with this source of energy are shown, to simplify the description, as being operated by direct current. I appreciate, however, that alternating current responsive devices may be substituted for those shown and in that event a transformer may be interposed between the high voltage line H-F-G and the low voltage line LV as a source of low voltage alternating current.

Following through the efiect of a jam or overload in the ejector assembly such as would shear the pin 32, it will be seen that the contacts or switch parts 36 and 37 will become separated and thus the circuit which has been maintained through the bed. frame as a ground for one side of the L-V line, the arm 3|, the switch 3l36, the collector ring 35 through wire 6a and through the relay and annunciator system will be broken. The eifect of brealnng the circuit through Ga is to de-energize the relay coil R6 and de-energize the annunciator coil A6. As the coil A6 is deenergized the signal of the annunciator responds to a spring (not shown) and indicates to the operator of the bolt machine that a release has occurred in the knockout assembly. A switch S6 in the relay box is normally maintained in a closed position by the flow of current through the relay coil RE and upon the break-down in the circuit through to the switch S5 is opened in response to a spring or similar device (not shown).

The switch S5 is one of a series of switches including S1, S8, S3, S2 and S9 in a solenoid circuit of the line VI running through the relay box, through solenoids Cl and C2 in the pointer switch box and through solenoids C3 and C4 in the main motor switch box and terminating in a ground on the bed frame of the machine. The

reak down in this circuit occasioned by the opening of the switch S6 de-energizes the solenoids C! to C4 inclusive. The de-energization of the solenoids Cl and C2 in the pointer switch box opens the high voltage line HF through switches SH! and SH and hence stops the flow of electrical energy to the pointer motor 50. The de-energization of the solenoids C3 and C4 in the main motor permits the switches SH and SH to move in response to springs (not shown) to discontinue the conduction of high voltage current through I-I--F to the main motor I00 tending to drive the same in a forward direction. As the switches Slfi and S13 swing in response to said spring action they re-establish a high voltage circuit to the main motor I00 through lines F2 and H2 which lead to terminals HI and Fl respectively on the main motor. In other words the movement of the switches SH and 8! upon the de-energization of the solenoids C3 and C4 reverses the three-phase motor HEB by switching the two outside high voltage wires. This characteristic of three phase motors will be understood by those skilled in the art.

The flow of electrical energy tending to turn the motor in a direction opposite to that which drives the bolt machine forward is maintained by a motor reverse cut-out iill until the machine ceases to: move in a forward or positive direction. The motor reverse cut-out 58! functions to discontinue the fiow from lines L2 and H2 intd the motor at the instant the machine comes to rest. The details of the motor reverse cut-out are not shown as such devices are well known in the art and any type which will accomplish the functions I have described will be suited to carrying out the teachings of my invention.

Separate manually operated switches 96 and 88 are arranged in the pointer and main motor circuit intermediate the motors and their switches 60 and It so that, if desired, one motor may be operated independently of the other. For instance the machine of the character disclosed in my copending application is suited for making certain types of belts in which the blanks are unpointed and are merely advanced through the pointer mechanism as an idle station and in making such blanks the motor would be rendered inoperative by opening the switch at 99.

Referring now to the next mechanism which is provided with a safety device and operates upon the bolt blanks formed in the machine is the safety mechanism indicated by the circle 8 in Figure l and illustrated in detail in Figure 8 wherein a member 4! which slidably supports a transfer carriage (as will be better understood by reference to the copending application of William L. Clouse, Serial No. 718,182) is pivoted on a shaft 52 which in turn is pivotally carried by a bed frame bracket and said member 4! is provided with a rearwardly extending portion 43. The bracket which supports the shaft 52 is apertured adjacent the extension 43 and a safety switch contact 44 projects through said aperture and is insulated with respect thereto by a suitably shaped sleeve. A wire 8a is connected to the member 45 and leads therefrom to the relay and annunciator assemblies heretofore: described.

In the event that the transfer fingers which grip the ejected blank as it is moved out of one die and transfers the blank to the next adjacent die should be engaged at the underside thereof by an ejected blank duevto a misalignment of the blank or a misalignment of the fingers, the entire transfer carriage will be swung upwardly away from the bed frame dies on the shaft '32. This advantage of this type of transfer will be better understood by reference to said copending application of William L. Clouse, Serial No. 718,182. The upward swinging of the carriage and bracket ti upon the shaft 52 moves the end of the member 43 downwardly against the'action of a spring pressed plunger 45 and thismovement breaks the circuit through wire 8a to its ground on the bed frame through member'43. The effect of breaking the circuit at this point is the same as the breaking of circuit in 6a heretofore described in that the relays break the solenoid circuit which ultimately brings the entire bolt machine toa stop. In this connection it is pointed out that the transfer carriage and fingers are swung upwardly only through the medium of an ejected blank and as will be understood said ejection takes place as the header slide is moving away from the bed frame dies. In this manner the functioning of the safety device 8 insures that the machine will not be brought to a stop when the header slide is in its most forward position and the tools and blanks therein are locked together. 10 The transfer drive safety device indicated by the circle I and illustrated in detail in Figure 'l is one which is applied in connection with a rotating shaft which effects thereciprocation of the transfer carriage. In the normal 5 operation of the machine the shaft 5| rotates the shaft 52 through the spring pressed interlocking engagement at 53, 54 and 55. The ring portion 54 is preferably splined to shaft 52 to rotate therewith, but is free to move axially thereof against the urging of the spring 55. The ring 53 is provided with a rib 56 arranged to contact a resilient leaf or switch element 5i which is carried by a bracket 58 depending from the 8a heretofore described.

When the normal reciprocation of the transfer O carriage is restricted or prevented by a misaligned blank or the like, the shaft 52 and its'splined ring 54 are prevented from rotating in unison with the shaft 55 and the projection 53 on the shaft 5! forces the ring 5d upwardly along its splined :5}; connection against the action of spring 55. This movement of the ring 54 upwardly moves the rib 56 upout of engagement with the switch element 5! and the circuit through the safety device is broken. Here, as in the last described safety 0 device, the agency which restricts the carriage reciprocation is usually an ejected blank, and as in the case of said described safety device, the header slide is receding from the bed frame dies at the time that the circuit is broken. The trans- 445 fer fingers are normally positioned in alignment with a bed frame die and receives a blank ejected therefrom as the header slide recedes. The fingers of the transfer grip the blank during the last phase of its ejection and transfer it to 4 the next adjacent die during the back centermotion of the header slide. If a blank improperly formed or improperly ejected sticks in the die and restrains the carriage in its reciprocation toward the next adjacent die, the safety switch 5 5 immediately becomes operative to stop the machine as the header slide moves to its back center position.

The blanks which are trimmed in the header punch as the last phase of the header slide oper- 60 ation are conducted through a hollow passageway in the header slide and emerge from the upper side of said slide into a conduit or tube 2!. As best illustrated in Figure 3 the conduit 21 is pivoted to the header slide through a resil-;,; ient sliding connection which permits the conduit to move upwardly if a jam should occur in the conduit 2!. Trimmed blanks being advanced upwardly to the conduit 2i tend to move the conduit upwardly against the action of the spring at. its pivoted header slide connection and the safety device indicated at circle 3 is designed to take advantage of this upward movement of the tube 2! to stop the machine. A bracket 6! is fixed to a header slide bearing cap or to a fixed posi-,-7;5

tion of the bed frame and supports at its upper end a pivoted lever 62 which projects forwardly in a manner to overhang the transfer tube 2! when the header slide is in a back center position. The lever 62 is extended rearwardly beyond its point of connection with support 6! as at 63 and said portion 63 cooperates with a bracket carried switch element 54 to maintain a circuit through wire 3a. If the transfer tube 2! becomes filled or jammed with bolt blanks, the tube 2! will be raised to the dotted line position of Figure 4 and in this raised position moves the portion 63 away from the switch element 64. This movement operates to break the low voltage circuit through the wire Ea which is connected to element 64 and the relay annunciator and solenoid circuits operate as heretofore described in connection with safety devices 6, l and 8. In this safety switch as in 5, l and 8 the machine is brought to a stop on back center motion of the header slide and there is no opportunity for the header slide tools to jam or look any bolt blanks in the bed frame dies.

As the bolt blanks are moved from the slotted portion of the tube 2! they are received by a track which leads downwardly to a pointer mechanism as will be better understood by reference to said copending application of John H. Friedman, Serial No. 712,220. The upper portion 71 (see Figuse 2) of said track is arcuate in shape and is pivoted at E2. The bolt blanks are moved along this arcuate portion by the action of the transfer tube 2i in its oscillating movement and said tube attains its maximum advance along the track 7! when the opening in the header slide is opposite the pointer track. As will be seen in Figure 1 the header slide is moving away from the bed frame dies and is approaching its position of maximum advance along the blank track H. If the blank track l! and the inclined portion '33 leading downwardly therefrom toward the pointing chuck should be filled with blanks due to a jam or overload in the pointer feed or chuck, the movement of the last blank on to the flat portion H of the track will take place at the time of the maximum advance of tube 2!. The effect of the movement of said last blank into the track 2i is to swing the pivoted section 7! upon its pivot 12 against the action of a spring or analogous means (not shown) and thus prevent the forcing of blanks into the track H or J3 which might damage the pointer or the tube 2!.

A block of insulating material is mounted adjacent the juncture between the pivoted section ll and the fixed section it of the track and carries thereon a safety switch element i l which cooperates with a complementary shaped ground element l5. A wire 2a leads from the element 14 to the relay and annunciator boxes and functions to actuate said mechanisms and motor switches in a manner heretofore described.

From the above description of the safety device on the pointer track it will be observed that it is a receding movement of the header slide which provides the maximum advance of the tube 2! along the track 7! and thus the safety device becomes operative to stop the machine only during a receding movement of the header slide.

After being pointed the blanks are preferably led to the roll threading. dies 18 and !9 by means of a track 22 and are arranged in a position between said roll threading dies by a blank feeding mechanism preferably constructed according to my copending application Serial No. 49,477, filed Nov. 13, 1935.

To actuate said blank feeding mechanism at the roll threading end of the track 22, a. shaft 8! is operatively connected to the driving mechanism of the bolt machine. As shown in Figure 9 and in said mentioned copending application of Earl R. Frost, Serial No. 662,719, the shaft 8! is rocked upon its axis by means of the oscillating arm 82. A safety latch arm 83 is adjustably secured to the shaft 8! and the oscillations of the arm 32 are transmitted to latch arm 8-3 through the medium of the safety latch 8 3. A sleeve on the arm 82. surrounds the shaft 8! and carries on its outer periphery an insulated ring 85 which in turn carries a collector ring 85. Mounted upon the bed frame through the medium of an insulated block is a brush 8? arranged to contact the collector ring 85. The wire 9a leads from said last named brush to the relay and annunciator boxes. pair of cooperating safety switch elements 88 and 89 are carried by the oscillating arm 82. and the latch arm 83 respectively.

The switch element 88 is connected to the collector ring 86 and in the normal operation of the blank feeding mechanism the latch 89 maintains switch elements 83 and B9 in contact. When, however, an overload or jamming of the blank feeding mechanism at the roll threader occurs the shaft 8! will be restrained thereby and the lever 82 will pull away from the safety latch 34. This moves the safety switch element 88 out of contact with the ground element 89 and the circuit through the wire 9a is broken effecting a stopping of the machine. Since the blank feeding mechanism is arranged to urge a bolt blank into position between the roll threading dies only at a time when the header slide is moving to its back center or roll threading position, the operation of the safety device 9 will stop the machine on said back center position.

From the foregoing description it will be observed that I have provided a machine for making bolts and the like with a plurality of mechanical safety devices and that I have combined with each of said mechanical safety devices a switch which maintains through electrical circuits a constant control over the motors of the machine. In the embodiment illustrated the wiring arrangement is not only a safety assembly which will protect the machine, but the assembly serves as a check upon the condition of the electrical safety devices as well. For instance, each of the wires, 5a, id, 811, 3a, 2a. and 9a and their relays serve the double function of maintaining the circuit which keeps the machine operating and also serve as a check upon the condition of the wiring itself, since a break in any of the circuits such as would be caused by an accidental. severing or breaking of one of the wires would operate to stop the machine and indicate through the annunciator which wire or relay was broken or defective. In other words, there is constant evidence in a safe signal in the annunciator that each of the wires leading to the various safety devices are in good condition and performing the function for which they are designed. The assembly is relatively inexpensive to construct since it requires but one wire from each of the safety devices and is inexpensive to maintain since the switch parts require no independent re-adjustment or replacement subsequent to their separation.

Although Ihave illustrated and described one embodiment of my invention in considerable detail and since variations therefrom may be made by those skilled in the art without departing from drive said motor in. a direction opposite normal forward drive and discontinue the application of tation of said motor upon mechanism actuation,

and means to discontinue the application of said reversing force upon the stopping of said machine.

2. A machine for making bolts or the like having a reciprocating header slide provided with tools and a bed frame provided with co-operating tools, electric motor means to drive said machine, a safety mechanism on said machine arranged to be actuated upon overload or jam in the machine, said safety mechanism operative upon actuation to sequentially discontinuethe conduction of electrical energy'to said motor to tend to drive said motor in a forward direction, conduct electrical energy to said motor tending to said last named motor reversing force upon the stopping of the machine.

3. A machine for making bolts having a bed frame and a reciprocating header slide, provided with co-operating tools and a high voltage line connected with an electric motor adapted to drive said machine, a low voltage line having safety devices in its circuit to control switches in said high voltage line, means to actuate said safety device when said header slide is in a back-center position, said last named'means' inoperative to actuate said devices when said header slide is in a forward position whereby, in the event of an overload or jam, said safety devices function thru the motor to stop the machine on. a backcenter position.

i. In. a machine for making bolts, having a bed frame and a header slide, each provided with a plurality of co-operating dies, means to eject bolt blanks from said dies and transferring means to move a bolt blank from one die to the next adjacent die, a safety mechanism. cperatively connected to said ejector means and transferring means and to the prime mover of said machine, said mechanism operative to bring the machine to a stop during a receding movement or back-center position. of said slide, said mechanism being inoperative to stop said machine. during an'appreaching or forward center position of said slide with respect to said bed frame dies.

5. A machine for making bolts or the like, having a bed frame provided with a plurality of lines running to said'motors, safety mechanism cperatively connected to said transfer means, a low voltage line operatively connected to said safety mechanism and to switches interposed .in said high voltage line whereby said safety mechanism is arranged upon actuation to discontinue the high voltage circuit to Said moto s thru S dswitches, re-establish a high voltage circuit to said main motor in a manner tending to reverse the direction of rotation of said motor and maintaining said last mentioned circuit until the machine comes to a stop. I

6. In a safety mechanism for a bolt making machine or the like, having massive moving parts, a high voltage line provided with switches connected to a main driving motor for said machine, a low volt-age line connected to a safety thin an annunciator, a solenoid operatively arranged with respect to said main motor switch energized by a low voltage line having switches therein controlled by said relay, whereby actuation of said safety switch upon overload deenergizes said relay and annunciator, the deenergization of said relay operative to open said solenoid circuit and the switch controlled thereby to stop said machine.

'7. A machine for making bolts and the like having a reciprocating header slide and a plurality of mechanisms adapted to carry out different fabricating operations upon the bolt blank, means to move a bolt blank from one fabricating mechanism upon the completion. of the operation therein and advance the same. toward the next fabricating mechanism, comprising a member moving in timed relation tosaid header slide and operative to move the bolt blank upon a receding movement or back center position of said header slide, a safety mechanism operatively connected to said member and actuated in response to an overload or jam in said means to discontinue the blank moving action of 7 said means, and of said header slide and said mechanisms.

8. A machine for making bolts and the like having a reciprocating header slide and a plurality of mechanisms adapted to carry out different fabricating operations upon the bolt blank, means to move a bolt blank from one fabricating mechamsm. upon the completion of the operationtherein and advance the same toward the next fabricating mechanism'comprising a member moving in timed relation to said header slide and operative to move the bolt blank upon. a receding movement or back center position of said header slide, a. safety mechanism operatively connected to said member and actuated in response to an over-load or jam in said means to discontinue the blank moving action of said means, a safety switch operatively connected to said means and to the prime mover of said machine actuated by the disruption of the blank moving action therein to stop said motor.

9. A machine for making bolts or the like comprising co-operating header slide and bed frame dies, an ejector assembly to eject a bolt blank from said dies subsequent to its working therein, said assembly arranged to move worked blanks out of the dies as the header slide recedes with respect to the bed frame dies, means to advance said ejector into said dies as the header slide recedes and a safety device interposed between said means and said ejector responsive upon over-load or jam. in said ejector to disengage said means and ejector to discontinue said advancing action, a safety switch operatively connected to said means arranged to stop a movement of the header slide upon said disengagement.

10. In a machine for makingbolts or the like, a bed frame having dies therein and a reciprocating header slide having tools arranged to co operate with said dies, a main motor connected through switches to a high voltage line to actuate said header slide, ejector mechanism arranged to move worked bolt blanks from said dies upon a receding motion or back center position of said header slide, driving means operatively connected to said motor to actuate said ejector, a safety device arranged in said ejector drive responsive to an over-load or jam in said ejector to discontinue the application of any driving force, a safety switch carried by said device normally operative to maintain a control circuit connected to said main motor switch, said safety switch actuated by operation of said safety device to break said circuit and thereby open said main motor switch to stop the machine.

11. A machine for making bolts or the like having a reciprocating header slide, a series of pairs of co-operative tools carried on said bed frame and header slide,'means to transfer blanks from one pair of tools in said series to the next adjacent pair comprising gripping fingers adapted to grip a blank as it is being ejected from one die and transfer and align the blank with the next adjacent die, said transfer fingers mounted to move with respect to the dies in event they are'forcibly engaged by a misaligned blank, a safety switch operatively connected to said transfer means and to the prime mover of said machine actuated by said last named movement to stop said machine.

12. A machine for making bolts or the like having a bed frame and a reciprocating header slide, co-operating tools carried by said bed frame and header slide, means on said header slide to receive a blanksubsequent to the last operation effected by said co-operating tools, a transfer tube resiliently connected to said header slide and bed frame adapted to conduct bolt blanks from said means to a fixed point on the bed frame, said transfer tube arranged to be moved with respect to said header slide through said resilient connection by incoming blanks in the event of a jam or over-load in said tube, a safety switch arranged to be moved by said tube when the tube is moved with respect to the header slide through said resilient connection, said safety switch operatively connected to the prime mover of the machine and operative when moved by said tube to stop said machine.

13. In a machine for making bolts or the like, a plurality of mechanisms adapted to perform different fabricating operations upon bolt blanks, a safety assembly for said machine comprising a plurality of safety devices connected to said mechanisms each comprising a safety switch maintained in one position during the normal operation of said mechanisms and adapted to be moved to another position by an overload or jam in said mechanisms, a main motor to drive said machine, a power line having switches therein connected to said motor, a safety switch line connected to said safety switches and through a relay to an annunciator, a control line connected through said relay to a motor switch control device, each of said safety switches moved in response to an overload or jam in its respective mechanism to actuate said relay and said annunciator, said relay actuation operative to actuate said switch control device and stop said motor, said annunciator actuation operative to signal to the machine operator which mechanism effects the stopping of the machine.

14. In a machine for making bolts having a header slide, a plurality of mechanisms adapted to perform different fabricating operations upon bolt blanks, a safety assembly for said machine comprising a plurality of safety devices connected to said mechanisms, each of said safety devices comprising a safety switch maintained in one position during the normal operation of said mechanism and adapted to be moved to another position by an over-load or jam in said mechanism, a main motor arranged to drive said machine and reciprocate said header slide, and a power line having switches therein connected to said motor, each of said mechanisms operatively connected to move in timed relation with said header slide, a safety switch line connected to the safety switches of each of said mechanisms and to an annunciator, said safety switch line also operatively connected to said power line switch, said safety switches arranged to be moved in response to an overload or jam only when said header slide is in a back center or receding position, said last named safety switch movement eifective to operate said power line switch and stop said motor and operate said annunciator to signal to the machine operator which mechanism initiated the stopping of the machine.

JOHN H. FRIEDMAN. 

